Popular brands i can think of are JVC, Panasonic, SONY and Canon....and...maybe Sharp.
Panasonic videocams tend to have very close specifications to that of SONY cams but are cheaper and the Optical zoom is abt 15X, if i'm not wrong all SONY videocams have only 10X optical zoom.
You might want to go for those with 3CCD for better quality...
Things to look out for....are the Lines of resolution...(i dont mean the resolution on the LCD panel of the Videocam)...it refers to the capture quality of the video.
If u need to snap stills....Megapixel ones are better.
Oh and....some models dont have built in video-light, so if u take in the dark or night....get one with a built in video light and with a SHOE to mount an external one IF u need in future.
(I made the mistake of not checking and mine didnt have one Nor does it has any shoe....)
As for DVD vs DV tapes....DV tapes are cheaper.....and if u EDIT ur tapes....it wont be much diff....since the Videocam will output the video VIA IEEE1394 to PC and after editing....u Covert MPEG and then to VCD or DVD format
Unless u are too lazy to edit and wants to record Direct to Disc and then PLAY. Then THe DVD-RAM might be better... IF u have a player capable of playing from the DVD-RAM or DVD-R format from the videocam
I find the tapes to Be more durable....as i find DVD to be more fragile...drop only...scratch or break...scary...
Most 3rd party products like Batteries, Wide Angle Convertors, Teleconvertors are available for all the above brands.
Though i find SONY tends to be more 'unique" in their products (not to mention expensive) than others.
For serious videoing...check for other accessories like .... External video-light, Video light battery packs (those lamps drain a lot).
A Extended Battery pack tends to last abt 2-3 hours, longer W/O the LCD on...using only the EYE-PIECE. Std ones...abt 1hr or so.
If you cover Entire Days events like wedding..or Outdoor festivals..etc. Extra batteries are highly recommended.
Since you are not a Canon user....lol....
I wont recommend the Canon XL-1S...lol (pro series)
http://www.canon.com.sg/index.cfm?fuseaction=dv&prod_type=xl1s
It can use Canon SLR lens w/an adaptor.. prices are like > $5000?